Does Maturity Affect Cephalic Perfusion and T/QRS Ratio during Prolonged Umbilical Cord Occlusion in Fetal Sheep?

Figure 2

Changes in fetal heart rate (FHR, % baseline), mean arterial pressure (MAP, % baseline), carotid blood flow (CaBF, % baseline), and T/QRS ratio in 0.6 gestation (0.6 GA; ▫), 0.7 gestation (0.7 GA; •), and 0.8 gestation (0.8 GA; ∘) fetuses during prolonged umbilical cord occlusion. Data are 5 min averages before occlusion, 5 sec averages during the first 10 minutes of occlusion, and 1 min averages for all other occlusion time points, expressed as percentage of baseline. The period of umbilical cord occlusion for each group begins at 0 min and ends at 15 min (0.8 GA), 25 min (0.7 GA), and 30 min (0.6 GA), respectively. Data are mean ± SEM; between-group comparisons by repeated measures ANOVA and LSD test. *𝑃<0.05; 0.6 GA versus 0.7 GA, ^†𝑃<0.05; 0.6 GA versus 0.8 GA, ^‡𝑃<0.05; 0.7 GA versus 0.8 GA.